linux-ext4 - Re: [Bug 207367] Accraid / aptec / Microsemi / ext4 / larger then 16TB

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Message-ID: <20200421164554.GA3271@infradead.org>
Date:   Tue, 21 Apr 2020 09:45:54 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jan Kara <jack@...e.cz>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Dave Chinner <david@...morbit.com>,
        Ritesh Harjani <riteshh@...ux.ibm.com>,
        bugzilla-daemon@...zilla.kernel.org, linux-ext4@...r.kernel.org,
        Theodore Ts'o <tytso@....edu>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-fsdevel@...r.kernel.org
Subject: Re: [Bug 207367] Accraid / aptec / Microsemi / ext4 / larger then
 16TB

On Tue, Apr 21, 2020 at 06:29:10PM +0200, Jan Kara wrote:
> Well, there are two problems with this - firstly, ocfs2 is also using jbd2
> and it knows nothing about iomap. So that would have to be implemented.
> Secondly, you have to somehow pass iomap ops to jbd2 so it all boils down
> to passing some callback to jbd2 during journal init to map blocks anyway
> as Dave said. And then it is upto filesystem to do the mapping - usually
> directly using its internal block mapping function - so no need for iomap
> AFAICT.

You'll need to describe the mapping some how.  So why not reuse an
existing mechanism instead of creating a new ad-hoc one?